What factor is fundamentally tied to the ability to see the Milky Way structure?
Answer
Contrast
The experience of seeing the Milky Way is fundamentally tied to contrast. When this contrast diminishes because the baseline brightness of the night sky rises, the faint galactic light falls below the threshold of human visibility.

#Videos
You will NEVER see The Milky Way again - YouTube
The Big Milky Way Problem (80% Will Never See This) - YouTube
Related Questions
What is the primary agent causing the erasure of the Milky Way view?What visual feature is the Milky Way described as when viewed edge-on?Approximately how much of the global population can no longer see the Milky Way?What factor is fundamentally tied to the ability to see the Milky Way structure?What term is often used for lighting designs that spill light horizontally or upward instead of focusing it down?How much time must the human eye usually be allowed to adapt to darkness to register the galaxy's faint signature?Which celestial phase should ideally be avoided when trying to observe the Milky Way?Which of these is NOT listed as one of the three main principles for responsible lighting design?What interacts with artificial light to create the luminous veil known as skyglow?If current trends in artificial lighting continue, within how many decades are projections suggesting the visible stars could be largely erased for even more people?What must a person born in a sprawling metropolitan area potentially travel hundreds of miles to witness?